<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card class="box-card">
          <!-- 警告区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                show-icon :closable="false" center>
            </el-alert>
            <!-- 步骤条:字符串转换成数字：
            1.转换函数(转换的是部分值)：parseInt(activeIndex)
            2.强制类型转换(ECMAScript转换的是整个值，而不是部分值)：Number(activeIndex)
            3.利用js变量弱类型转换(不推荐):activeIndex-0 只进行了算术运算，实现了字符串到数字的类型转换
            -->
            <el-steps :space="200" :active="Number(activeIndex)" finish-status="success" align-center id="onlyStep">
              <el-step title="基本信息"></el-step>
              <el-step title="商品参数"></el-step>
              <el-step title="商品属性"></el-step>
              <el-step title="商品图片"></el-step>
              <el-step title="商品内容"></el-step>
              <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab : el-tab-pane只能作为el-tabs的子节点，中间不能插入其他节点，因此form只能置于最外层-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
              <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                  <el-form-item label="商品名称" prop="goods_name">
                    <el-input v-model="addForm.goods_name"></el-input>
                  </el-form-item>
                  <el-form-item label="商品价格" prop="goods_price">
                    <el-input v-model="addForm.goods_price"></el-input>
                  </el-form-item>
                  <el-form-item label="商品重量" prop="goods_weight">
                    <el-input v-model="addForm.goods_weight"></el-input>
                  </el-form-item>
                  <el-form-item label="商品数量" prop="goods_number">
                    <el-input v-model="addForm.goods_number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品分类" prop="goods_cat">
                    <el-cascader
                      v-model="addForm.goods_cat"
                      :options="cateList"
                      :props="cateProps"
                      @change="handleChange" clearable>
                    </el-cascader>
                  </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                  <!-- 渲染表达的item -->
                  <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                  </el-checkbox-group>
                  </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                  </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                  <!-- action:图片上传地址，需写绝对路径 -->
                  <el-upload
                    class="upload-demo"
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                    <el-button size="small" type="primary">点击上传</el-button>
                  </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4" id="quilEditor">
                  <!-- 富文本编辑器 -->
                  <quill-editor v-model="addForm.goods_introduce">
                  </quill-editor>
                  <!-- 添加商品按钮 -->
                  <el-button type="primary" class="addBtn" @click="addGoods">添加商品</el-button>
                </el-tab-pane>
              </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" class="imgPreview">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: {},
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'change' }]

      },
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        checkStrictly: false,
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      manyTableData: [],
      onlyTableData: [],
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传的请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: [],
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else if (this.addForm.goods_cat.length === 2) {
        return this.addForm.goods_cat[1]
      } else {
        return null
      }
    }
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      // cateList赋值
      this.cateList = res.data
      // console.log(this.cateList)
    },
    // 级联选择器变化
    handleChange() {
      console.log(this.addForm.goods_cat)
      /* if (this.addForm.goods_cat.length !== 3 || this.addForm.goods_cat.length !== 2) {
        this.addForm.goods_cat.length = []
      } */
    },
    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('进入函数')
      if (oldActiveName === '0') {
        // console.log('oldActiveName=0')
        if (this.addForm.goods_cat.length === 3 || this.addForm.goods_cat.length === 2) {
          if (this.addForm.goods_name === '' || this.addForm.goods_price === '' || this.addForm.goods_weight === '' || this.addForm.goods_number === '') {
            this.$message.error('请输入商品名称、商品价格、商品重量或商品数量')
            return false
          }
        } else {
          this.$message.error('请选择商品分类')
          return false
        }
      }
    },
    // 点击对应的tab是商品参数或商品属性
    async tabClicked() {
      // console.log(this.activeIndex)
      // 动态参数列表
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          this.$message.error('获取动态参数失败')
        }
        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 静态属性列表
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          this.$message.error('获取静态属性失败')
        }
        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 预览图片
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片
    handleRemove(file) {
      console.log(file)
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组中的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功事件
    handleSuccess(response) {
      console.log(response)
      // 1.拼接的到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将对象push到pics数组中
      console.log(this.addForm)
      this.addForm.pics.push(picInfo)
    },
    async addGoods() {
      console.log(this.addForm)
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项')

        // 执行业务的逻辑 lodash cloneDeep(value)深拷贝
        const form = _.cloneDeep(this.addForm)
        // join(',')将数组变成字符串
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求：商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  }
}
</script>
<style lang="scss" scoped>
.el-steps{
  margin: 20px 0;
}
.el-checkbox{
  margin:0;
}
.imgPreview{
  width: 100%;
}
.addBtn{
  margin-top: 15px;
}
</style>
